Every now and then when I post a question somebody places an answer, but does not actually answer my question/solve the problem I am looking for and WPSE treats it as a legitimate answer and it affects the accept rating, which in turn affects the likely hood of me getting an answer on future questions.

I was wanting to propose the ability to have like a dash or a cross button that, without damage to the answerers rep, basically says "Cheers for the answer but it isn't what I am looking for and/or didn't solve the problem."

I believe this would be beneficial as new people across the question will be able to see that the question has not been answered and make an informed decision on whether or not they want to help, rather than assume that the question has been answered or is in correspondence.